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Code Issues Projects Releases Wiki Activity

Problem: network initialization and shutdown functions not available for

Browse Source 
reuse

Solution: extract into functions defined in ip.hpp

Problem: signaler_t::make_fdpair not reusable

Solution: move make_fdpair to ip.hpp

Problem: epoll worker with no fds cannot be stopped

Solution: use interruptible epoll_pwait call

Problem: insufficient unit tests for poller

Solution: add test cases
This commit is contained in:
Simon Giesecke 2018-02-09 11:03:30 +01:00
parent ecb3b503c3
commit e8e24030ea
9 changed files with 630 additions and 392 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/epoll.cpp
View File

@ -35,6 +35,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <algorithm>
#include <new>
@ -45,8 +46,7 @@
#include "i_poll_events.hpp"
zmq::epoll_t::epoll_t (const zmq::thread_ctx_t &ctx_) :
ctx (ctx_),
stopping (false)
worker_poller_base_t (ctx_)
{
#ifdef ZMQ_USE_EPOLL_CLOEXEC
// Setting this option result in sane behaviour when exec() functions
@ -62,7 +62,7 @@ zmq::epoll_t::epoll_t (const zmq::thread_ctx_t &ctx_) :
zmq::epoll_t::~epoll_t ()
{
// Wait till the worker thread exits.
worker.stop ();
stop_worker ();
close (epoll_fd);
for (retired_t::iterator it = retired.begin (); it != retired.end ();
@ -73,6 +73,7 @@ zmq::epoll_t::~epoll_t ()
zmq::epoll_t::handle_t zmq::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
{
check_thread ();
poll_entry_t *pe = new (std::nothrow) poll_entry_t;
alloc_assert (pe);
@ -96,6 +97,7 @@ zmq::epoll_t::handle_t zmq::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
void zmq::epoll_t::rm_fd (handle_t handle_)
{
check_thread ();
poll_entry_t *pe = (poll_entry_t *) handle_;
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_DEL, pe->fd, &pe->ev);
errno_assert (rc != -1);
@ -110,6 +112,7 @@ void zmq::epoll_t::rm_fd (handle_t handle_)
void zmq::epoll_t::set_pollin (handle_t handle_)
{
check_thread ();
poll_entry_t *pe = (poll_entry_t *) handle_;
pe->ev.events |= EPOLLIN;
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
@ -118,6 +121,7 @@ void zmq::epoll_t::set_pollin (handle_t handle_)
void zmq::epoll_t::reset_pollin (handle_t handle_)
{
check_thread ();
poll_entry_t *pe = (poll_entry_t *) handle_;
pe->ev.events &= ~((short) EPOLLIN);
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
@ -126,6 +130,7 @@ void zmq::epoll_t::reset_pollin (handle_t handle_)
void zmq::epoll_t::set_pollout (handle_t handle_)
{
check_thread ();
poll_entry_t *pe = (poll_entry_t *) handle_;
pe->ev.events |= EPOLLOUT;
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
@ -134,20 +139,16 @@ void zmq::epoll_t::set_pollout (handle_t handle_)
void zmq::epoll_t::reset_pollout (handle_t handle_)
{
check_thread ();
poll_entry_t *pe = (poll_entry_t *) handle_;
pe->ev.events &= ~((short) EPOLLOUT);
int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
errno_assert (rc != -1);
}
void zmq::epoll_t::start ()
{
ctx.start_thread (worker, worker_routine, this);
}
void zmq::epoll_t::stop ()
{
stopping = true;
check_thread ();
}
int zmq::epoll_t::max_fds ()
@ -159,10 +160,18 @@ void zmq::epoll_t::loop ()
{
epoll_event ev_buf[max_io_events];
while (!stopping) {
while (true) {
// Execute any due timers.
int timeout = (int) execute_timers ();
if (get_load () == 0) {
if (timeout == 0)
break;
// TODO sleep for timeout
continue;
}
// Wait for events.
int n = epoll_wait (epoll_fd, &ev_buf[0], max_io_events,
timeout ? timeout : -1);
@ -199,9 +208,4 @@ void zmq::epoll_t::loop ()
}
}
void zmq::epoll_t::worker_routine (void *arg_)
{
((epoll_t *) arg_)->loop ();
}
#endif

12
src/epoll.hpp
View File

@ -50,7 +50,7 @@ struct i_poll_events;
// This class implements socket polling mechanism using the Linux-specific
// epoll mechanism.
class epoll_t : public poller_base_t
class epoll_t : public worker_poller_base_t
{
public:
typedef void *handle_t;
@ -65,21 +65,14 @@ class epoll_t : public poller_base_t
void reset_pollin (handle_t handle_);
void set_pollout (handle_t handle_);
void reset_pollout (handle_t handle_);
void start ();
void stop ();
static int max_fds ();
private:
// Main worker thread routine.
static void worker_routine (void *arg_);
// Main event loop.
void loop ();
// Reference to ZMQ context.
const thread_ctx_t &ctx;
// Main epoll file descriptor
fd_t epoll_fd;
@ -94,9 +87,6 @@ class epoll_t : public poller_base_t
typedef std::vector<poll_entry_t *> retired_t;
retired_t retired;
// If true, thread is in the process of shutting down.
bool stopping;
// Handle of the physical thread doing the I/O work.
thread_t worker;

380
src/ip.cpp
View File

@ -31,6 +31,7 @@
#include "ip.hpp"
#include "err.hpp"
#include "macros.hpp"
#include "config.hpp"
#if !defined ZMQ_HAVE_WINDOWS
#include <fcntl.h>
@ -39,12 +40,26 @@
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#else
#include "tcp.hpp"
#endif
#if defined ZMQ_HAVE_OPENVMS
#include <ioctl.h>
#endif
#if defined ZMQ_HAVE_EVENTFD
#include <sys/eventfd.h>
#endif
#if defined ZMQ_HAVE_OPENPGM
#ifdef ZMQ_HAVE_WINDOWS
#define __PGM_WININT_H__
#endif
#include <pgm/pgm.h>
#endif
zmq::fd_t zmq::open_socket (int domain_, int type_, int protocol_)
{
int rc;
@ -229,3 +244,368 @@ void zmq::bind_to_device (fd_t s_, std::string &bound_device_)
LIBZMQ_UNUSED (bound_device_);
#endif
}
bool zmq::initialize_network ()
{
#if defined ZMQ_HAVE_OPENPGM
// Init PGM transport. Ensure threading and timer are enabled. Find PGM
// protocol ID. Note that if you want to use gettimeofday and sleep for
// openPGM timing, set environment variables PGM_TIMER to "GTOD" and
// PGM_SLEEP to "USLEEP".
pgm_error_t *pgm_error = NULL;
const bool ok = pgm_init (&pgm_error);
if (ok != TRUE) {
// Invalid parameters don't set pgm_error_t
zmq_assert (pgm_error != NULL);
if (pgm_error->domain == PGM_ERROR_DOMAIN_TIME
&& (pgm_error->code == PGM_ERROR_FAILED)) {
// Failed to access RTC or HPET device.
pgm_error_free (pgm_error);
errno = EINVAL;
return false;
}
// PGM_ERROR_DOMAIN_ENGINE: WSAStartup errors or missing WSARecvMsg.
zmq_assert (false);
}
#endif
#ifdef ZMQ_HAVE_WINDOWS
// Intialise Windows sockets. Note that WSAStartup can be called multiple
// times given that WSACleanup will be called for each WSAStartup.
WORD version_requested = MAKEWORD (2, 2);
WSADATA wsa_data;
int rc = WSAStartup (version_requested, &wsa_data);
zmq_assert (rc == 0);
zmq_assert (LOBYTE (wsa_data.wVersion) == 2
&& HIBYTE (wsa_data.wVersion) == 2);
#endif
return true;
}
void zmq::shutdown_network ()
{
#ifdef ZMQ_HAVE_WINDOWS
// On Windows, uninitialise socket layer.
int rc = WSACleanup ();
wsa_assert (rc != SOCKET_ERROR);
#endif
#if defined ZMQ_HAVE_OPENPGM
// Shut down the OpenPGM library.
if (pgm_shutdown () != TRUE)
zmq_assert (false);
#endif
}
#if defined ZMQ_HAVE_WINDOWS
static void tune_socket (const SOCKET socket)
{
BOOL tcp_nodelay = 1;
int rc = setsockopt (socket, IPPROTO_TCP, TCP_NODELAY,
(char *) &tcp_nodelay, sizeof tcp_nodelay);
wsa_assert (rc != SOCKET_ERROR);
zmq::tcp_tune_loopback_fast_path (socket);
}
#endif
int zmq::make_fdpair (fd_t *r_, fd_t *w_)
{
#if defined ZMQ_HAVE_EVENTFD
int flags = 0;
#if defined ZMQ_HAVE_EVENTFD_CLOEXEC
// Setting this option result in sane behaviour when exec() functions
// are used. Old sockets are closed and don't block TCP ports, avoid
// leaks, etc.
flags |= EFD_CLOEXEC;
#endif
fd_t fd = eventfd (0, flags);
if (fd == -1) {
errno_assert (errno == ENFILE || errno == EMFILE);
*w_ = *r_ = -1;
return -1;
} else {
*w_ = *r_ = fd;
return 0;
}
#elif defined ZMQ_HAVE_WINDOWS
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
// Windows CE does not manage security attributes
SECURITY_DESCRIPTOR sd;
SECURITY_ATTRIBUTES sa;
memset (&sd, 0, sizeof sd);
memset (&sa, 0, sizeof sa);
InitializeSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl (&sd, TRUE, 0, FALSE);
sa.nLength = sizeof (SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = &sd;
#endif
// This function has to be in a system-wide critical section so that
// two instances of the library don't accidentally create signaler
// crossing the process boundary.
// We'll use named event object to implement the critical section.
// Note that if the event object already exists, the CreateEvent requests
// EVENT_ALL_ACCESS access right. If this fails, we try to open
// the event object asking for SYNCHRONIZE access only.
HANDLE sync = NULL;
// Create critical section only if using fixed signaler port
// Use problematic Event implementation for compatibility if using old port 5905.
// Otherwise use Mutex implementation.
int event_signaler_port = 5905;
if (signaler_port == event_signaler_port) {
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
sync =
CreateEventW (&sa, FALSE, TRUE, L"Global\\zmq-signaler-port-sync");
#else
sync =
CreateEventW (NULL, FALSE, TRUE, L"Global\\zmq-signaler-port-sync");
#endif
if (sync == NULL && GetLastError () == ERROR_ACCESS_DENIED)
sync = OpenEventW (SYNCHRONIZE | EVENT_MODIFY_STATE, FALSE,
L"Global\\zmq-signaler-port-sync");
win_assert (sync != NULL);
} else if (signaler_port != 0) {
wchar_t mutex_name[MAX_PATH];
#ifdef __MINGW32__
_snwprintf (mutex_name, MAX_PATH, L"Global\\zmq-signaler-port-%d",
signaler_port);
#else
swprintf (mutex_name, MAX_PATH, L"Global\\zmq-signaler-port-%d",
signaler_port);
#endif
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
sync = CreateMutexW (&sa, FALSE, mutex_name);
#else
sync = CreateMutexW (NULL, FALSE, mutex_name);
#endif
if (sync == NULL && GetLastError () == ERROR_ACCESS_DENIED)
sync = OpenMutexW (SYNCHRONIZE, FALSE, mutex_name);
win_assert (sync != NULL);
}
// Windows has no 'socketpair' function. CreatePipe is no good as pipe
// handles cannot be polled on. Here we create the socketpair by hand.
*w_ = INVALID_SOCKET;
*r_ = INVALID_SOCKET;
// Create listening socket.
SOCKET listener;
listener = open_socket (AF_INET, SOCK_STREAM, 0);
wsa_assert (listener != INVALID_SOCKET);
// Set SO_REUSEADDR and TCP_NODELAY on listening socket.
BOOL so_reuseaddr = 1;
int rc = setsockopt (listener, SOL_SOCKET, SO_REUSEADDR,
(char *) &so_reuseaddr, sizeof so_reuseaddr);
wsa_assert (rc != SOCKET_ERROR);
tune_socket (listener);
// Init sockaddr to signaler port.
struct sockaddr_in addr;
memset (&addr, 0, sizeof addr);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
addr.sin_port = htons (signaler_port);
// Create the writer socket.
*w_ = open_socket (AF_INET, SOCK_STREAM, 0);
wsa_assert (*w_ != INVALID_SOCKET);
// Set TCP_NODELAY on writer socket.
tune_socket (*w_);
if (sync != NULL) {
// Enter the critical section.
DWORD dwrc = WaitForSingleObject (sync, INFINITE);
zmq_assert (dwrc == WAIT_OBJECT_0 || dwrc == WAIT_ABANDONED);
}
// Bind listening socket to signaler port.
rc = bind (listener, (const struct sockaddr *) &addr, sizeof addr);
if (rc != SOCKET_ERROR && signaler_port == 0) {
// Retrieve ephemeral port number
int addrlen = sizeof addr;
rc = getsockname (listener, (struct sockaddr *) &addr, &addrlen);
}
// Listen for incoming connections.
if (rc != SOCKET_ERROR)
rc = listen (listener, 1);
// Connect writer to the listener.
if (rc != SOCKET_ERROR)
rc = connect (*w_, (struct sockaddr *) &addr, sizeof addr);
// Accept connection from writer.
if (rc != SOCKET_ERROR)
*r_ = accept (listener, NULL, NULL);
// Send/receive large chunk to work around TCP slow start
// This code is a workaround for #1608
if (*r_ != INVALID_SOCKET) {
size_t dummy_size =
1024 * 1024; // 1M to overload default receive buffer
unsigned char *dummy = (unsigned char *) malloc (dummy_size);
wsa_assert (dummy);
int still_to_send = (int) dummy_size;
int still_to_recv = (int) dummy_size;
while (still_to_send || still_to_recv) {
int nbytes;
if (still_to_send > 0) {
nbytes =
::send (*w_, (char *) (dummy + dummy_size - still_to_send),
still_to_send, 0);
wsa_assert (nbytes != SOCKET_ERROR);
still_to_send -= nbytes;
}
nbytes = ::recv (*r_, (char *) (dummy + dummy_size - still_to_recv),
still_to_recv, 0);
wsa_assert (nbytes != SOCKET_ERROR);
still_to_recv -= nbytes;
}
free (dummy);
}
// Save errno if error occurred in bind/listen/connect/accept.
int saved_errno = 0;
if (*r_ == INVALID_SOCKET)
saved_errno = WSAGetLastError ();
// We don't need the listening socket anymore. Close it.
rc = closesocket (listener);
wsa_assert (rc != SOCKET_ERROR);
if (sync != NULL) {
// Exit the critical section.
BOOL brc;
if (signaler_port == event_signaler_port)
brc = SetEvent (sync);
else
brc = ReleaseMutex (sync);
win_assert (brc != 0);
// Release the kernel object
brc = CloseHandle (sync);
win_assert (brc != 0);
}
if (*r_ != INVALID_SOCKET) {
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
// On Windows, preventing sockets to be inherited by child processes.
BOOL brc = SetHandleInformation ((HANDLE) *r_, HANDLE_FLAG_INHERIT, 0);
win_assert (brc);
#endif
return 0;
} else {
// Cleanup writer if connection failed
if (*w_ != INVALID_SOCKET) {
rc = closesocket (*w_);
wsa_assert (rc != SOCKET_ERROR);
*w_ = INVALID_SOCKET;
}
// Set errno from saved value
errno = wsa_error_to_errno (saved_errno);
return -1;
}
#elif defined ZMQ_HAVE_OPENVMS
// Whilst OpenVMS supports socketpair - it maps to AF_INET only. Further,
// it does not set the socket options TCP_NODELAY and TCP_NODELACK which
// can lead to performance problems.
//
// The bug will be fixed in V5.6 ECO4 and beyond. In the meantime, we'll
// create the socket pair manually.
struct sockaddr_in lcladdr;
memset (&lcladdr, 0, sizeof lcladdr);
lcladdr.sin_family = AF_INET;
lcladdr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
lcladdr.sin_port = 0;
int listener = open_socket (AF_INET, SOCK_STREAM, 0);
errno_assert (listener != -1);
int on = 1;
int rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
errno_assert (rc != -1);
rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELACK, &on, sizeof on);
errno_assert (rc != -1);
rc = bind (listener, (struct sockaddr *) &lcladdr, sizeof lcladdr);
errno_assert (rc != -1);
socklen_t lcladdr_len = sizeof lcladdr;
rc = getsockname (listener, (struct sockaddr *) &lcladdr, &lcladdr_len);
errno_assert (rc != -1);
rc = listen (listener, 1);
errno_assert (rc != -1);
*w_ = open_socket (AF_INET, SOCK_STREAM, 0);
errno_assert (*w_ != -1);
rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
errno_assert (rc != -1);
rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELACK, &on, sizeof on);
errno_assert (rc != -1);
rc = connect (*w_, (struct sockaddr *) &lcladdr, sizeof lcladdr);
errno_assert (rc != -1);
*r_ = accept (listener, NULL, NULL);
errno_assert (*r_ != -1);
close (listener);
return 0;
#else
// All other implementations support socketpair()
int sv[2];
int type = SOCK_STREAM;
// Setting this option result in sane behaviour when exec() functions
// are used. Old sockets are closed and don't block TCP ports, avoid
// leaks, etc.
#if defined ZMQ_HAVE_SOCK_CLOEXEC
type |= SOCK_CLOEXEC;
#endif
int rc = socketpair (AF_UNIX, type, 0, sv);
if (rc == -1) {
errno_assert (errno == ENFILE || errno == EMFILE);
*w_ = *r_ = -1;
return -1;
} else {
// If there's no SOCK_CLOEXEC, let's try the second best option. Note that
// race condition can cause socket not to be closed (if fork happens
// between socket creation and this point).
#if !defined ZMQ_HAVE_SOCK_CLOEXEC && defined FD_CLOEXEC
rc = fcntl (sv[0], F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
rc = fcntl (sv[1], F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
#endif
*w_ = sv[0];
*r_ = sv[1];
return 0;
}
#endif
}

10
src/ip.hpp
View File

@ -57,6 +57,16 @@ int set_nosigpipe (fd_t s_);
// Binds the underlying socket to the given device, eg. VRF or interface
void bind_to_device (fd_t s_, std::string &bound_device_);
// Initialize network subsystem. May be called multiple times. Each call must be matched by a call to shutdown_network.
bool initialize_network ();
// Shutdown network subsystem. Must be called once for each call to initialize_network before terminating.
void shutdown_network ();
// Creates a pair of sockets (using signaler_port on OS using TCP sockets).
// Returns -1 if we could not make the socket pair successfully
int make_fdpair (fd_t *r_, fd_t *w_);
}
#endif

314
src/signaler.cpp
View File

@ -67,10 +67,6 @@
#include "ip.hpp"
#include "tcp.hpp"
#if defined ZMQ_HAVE_EVENTFD
#include <sys/eventfd.h>
#endif
#if !defined ZMQ_HAVE_WINDOWS
#include <unistd.h>
#include <netinet/tcp.h>
@ -384,313 +380,3 @@ void zmq::signaler_t::forked ()
make_fdpair (&r, &w);
}
#endif
#if defined ZMQ_HAVE_WINDOWS
static void tune_socket (const SOCKET socket)
{
BOOL tcp_nodelay = 1;
int rc = setsockopt (socket, IPPROTO_TCP, TCP_NODELAY,
(char *) &tcp_nodelay, sizeof tcp_nodelay);
wsa_assert (rc != SOCKET_ERROR);
zmq::tcp_tune_loopback_fast_path (socket);
}
#endif
// Returns -1 if we could not make the socket pair successfully
int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_)
{
#if defined ZMQ_HAVE_EVENTFD
int flags = 0;
#if defined ZMQ_HAVE_EVENTFD_CLOEXEC
// Setting this option result in sane behaviour when exec() functions
// are used. Old sockets are closed and don't block TCP ports, avoid
// leaks, etc.
flags |= EFD_CLOEXEC;
#endif
fd_t fd = eventfd (0, flags);
if (fd == -1) {
errno_assert (errno == ENFILE || errno == EMFILE);
*w_ = *r_ = -1;
return -1;
} else {
*w_ = *r_ = fd;
return 0;
}
#elif defined ZMQ_HAVE_WINDOWS
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
// Windows CE does not manage security attributes
SECURITY_DESCRIPTOR sd;
SECURITY_ATTRIBUTES sa;
memset (&sd, 0, sizeof sd);
memset (&sa, 0, sizeof sa);
InitializeSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl (&sd, TRUE, 0, FALSE);
sa.nLength = sizeof (SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = &sd;
#endif
// This function has to be in a system-wide critical section so that
// two instances of the library don't accidentally create signaler
// crossing the process boundary.
// We'll use named event object to implement the critical section.
// Note that if the event object already exists, the CreateEvent requests
// EVENT_ALL_ACCESS access right. If this fails, we try to open
// the event object asking for SYNCHRONIZE access only.
HANDLE sync = NULL;
// Create critical section only if using fixed signaler port
// Use problematic Event implementation for compatibility if using old port 5905.
// Otherwise use Mutex implementation.
int event_signaler_port = 5905;
if (signaler_port == event_signaler_port) {
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
sync =
CreateEventW (&sa, FALSE, TRUE, L"Global\\zmq-signaler-port-sync");
#else
sync =
CreateEventW (NULL, FALSE, TRUE, L"Global\\zmq-signaler-port-sync");
#endif
if (sync == NULL && GetLastError () == ERROR_ACCESS_DENIED)
sync = OpenEventW (SYNCHRONIZE | EVENT_MODIFY_STATE, FALSE,
L"Global\\zmq-signaler-port-sync");
win_assert (sync != NULL);
} else if (signaler_port != 0) {
wchar_t mutex_name[MAX_PATH];
#ifdef __MINGW32__
_snwprintf (mutex_name, MAX_PATH, L"Global\\zmq-signaler-port-%d",
signaler_port);
#else
swprintf (mutex_name, MAX_PATH, L"Global\\zmq-signaler-port-%d",
signaler_port);
#endif
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
sync = CreateMutexW (&sa, FALSE, mutex_name);
#else
sync = CreateMutexW (NULL, FALSE, mutex_name);
#endif
if (sync == NULL && GetLastError () == ERROR_ACCESS_DENIED)
sync = OpenMutexW (SYNCHRONIZE, FALSE, mutex_name);
win_assert (sync != NULL);
}
// Windows has no 'socketpair' function. CreatePipe is no good as pipe
// handles cannot be polled on. Here we create the socketpair by hand.
*w_ = INVALID_SOCKET;
*r_ = INVALID_SOCKET;
// Create listening socket.
SOCKET listener;
listener = open_socket (AF_INET, SOCK_STREAM, 0);
wsa_assert (listener != INVALID_SOCKET);
// Set SO_REUSEADDR and TCP_NODELAY on listening socket.
BOOL so_reuseaddr = 1;
int rc = setsockopt (listener, SOL_SOCKET, SO_REUSEADDR,
(char *) &so_reuseaddr, sizeof so_reuseaddr);
wsa_assert (rc != SOCKET_ERROR);
tune_socket (listener);
// Init sockaddr to signaler port.
struct sockaddr_in addr;
memset (&addr, 0, sizeof addr);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
addr.sin_port = htons (signaler_port);
// Create the writer socket.
*w_ = open_socket (AF_INET, SOCK_STREAM, 0);
wsa_assert (*w_ != INVALID_SOCKET);
// Set TCP_NODELAY on writer socket.
tune_socket (*w_);
if (sync != NULL) {
// Enter the critical section.
DWORD dwrc = WaitForSingleObject (sync, INFINITE);
zmq_assert (dwrc == WAIT_OBJECT_0 || dwrc == WAIT_ABANDONED);
}
// Bind listening socket to signaler port.
rc = bind (listener, (const struct sockaddr *) &addr, sizeof addr);
if (rc != SOCKET_ERROR && signaler_port == 0) {
// Retrieve ephemeral port number
int addrlen = sizeof addr;
rc = getsockname (listener, (struct sockaddr *) &addr, &addrlen);
}
// Listen for incoming connections.
if (rc != SOCKET_ERROR)
rc = listen (listener, 1);
// Connect writer to the listener.
if (rc != SOCKET_ERROR)
rc = connect (*w_, (struct sockaddr *) &addr, sizeof addr);
// Accept connection from writer.
if (rc != SOCKET_ERROR)
*r_ = accept (listener, NULL, NULL);
// Send/receive large chunk to work around TCP slow start
// This code is a workaround for #1608
if (*r_ != INVALID_SOCKET) {
size_t dummy_size =
1024 * 1024; // 1M to overload default receive buffer
unsigned char *dummy = (unsigned char *) malloc (dummy_size);
wsa_assert (dummy);
int still_to_send = (int) dummy_size;
int still_to_recv = (int) dummy_size;
while (still_to_send || still_to_recv) {
int nbytes;
if (still_to_send > 0) {
nbytes =
::send (*w_, (char *) (dummy + dummy_size - still_to_send),
still_to_send, 0);
wsa_assert (nbytes != SOCKET_ERROR);
still_to_send -= nbytes;
}
nbytes = ::recv (*r_, (char *) (dummy + dummy_size - still_to_recv),
still_to_recv, 0);
wsa_assert (nbytes != SOCKET_ERROR);
still_to_recv -= nbytes;
}
free (dummy);
}
// Save errno if error occurred in bind/listen/connect/accept.
int saved_errno = 0;
if (*r_ == INVALID_SOCKET)
saved_errno = WSAGetLastError ();
// We don't need the listening socket anymore. Close it.
rc = closesocket (listener);
wsa_assert (rc != SOCKET_ERROR);
if (sync != NULL) {
// Exit the critical section.
BOOL brc;
if (signaler_port == event_signaler_port)
brc = SetEvent (sync);
else
brc = ReleaseMutex (sync);
win_assert (brc != 0);
// Release the kernel object
brc = CloseHandle (sync);
win_assert (brc != 0);
}
if (*r_ != INVALID_SOCKET) {
#if !defined _WIN32_WCE && !defined ZMQ_HAVE_WINDOWS_UWP
// On Windows, preventing sockets to be inherited by child processes.
BOOL brc = SetHandleInformation ((HANDLE) *r_, HANDLE_FLAG_INHERIT, 0);
win_assert (brc);
#endif
return 0;
} else {
// Cleanup writer if connection failed
if (*w_ != INVALID_SOCKET) {
rc = closesocket (*w_);
wsa_assert (rc != SOCKET_ERROR);
*w_ = INVALID_SOCKET;
}
// Set errno from saved value
errno = wsa_error_to_errno (saved_errno);
return -1;
}
#elif defined ZMQ_HAVE_OPENVMS
// Whilst OpenVMS supports socketpair - it maps to AF_INET only. Further,
// it does not set the socket options TCP_NODELAY and TCP_NODELACK which
// can lead to performance problems.
//
// The bug will be fixed in V5.6 ECO4 and beyond. In the meantime, we'll
// create the socket pair manually.
struct sockaddr_in lcladdr;
memset (&lcladdr, 0, sizeof lcladdr);
lcladdr.sin_family = AF_INET;
lcladdr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
lcladdr.sin_port = 0;
int listener = open_socket (AF_INET, SOCK_STREAM, 0);
errno_assert (listener != -1);
int on = 1;
int rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
errno_assert (rc != -1);
rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELACK, &on, sizeof on);
errno_assert (rc != -1);
rc = bind (listener, (struct sockaddr *) &lcladdr, sizeof lcladdr);
errno_assert (rc != -1);
socklen_t lcladdr_len = sizeof lcladdr;
rc = getsockname (listener, (struct sockaddr *) &lcladdr, &lcladdr_len);
errno_assert (rc != -1);
rc = listen (listener, 1);
errno_assert (rc != -1);
*w_ = open_socket (AF_INET, SOCK_STREAM, 0);
errno_assert (*w_ != -1);
rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
errno_assert (rc != -1);
rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELACK, &on, sizeof on);
errno_assert (rc != -1);
rc = connect (*w_, (struct sockaddr *) &lcladdr, sizeof lcladdr);
errno_assert (rc != -1);
*r_ = accept (listener, NULL, NULL);
errno_assert (*r_ != -1);
close (listener);
return 0;
#else
// All other implementations support socketpair()
int sv[2];
int type = SOCK_STREAM;
// Setting this option result in sane behaviour when exec() functions
// are used. Old sockets are closed and don't block TCP ports, avoid
// leaks, etc.
#if defined ZMQ_HAVE_SOCK_CLOEXEC
type |= SOCK_CLOEXEC;
#endif
int rc = socketpair (AF_UNIX, type, 0, sv);
if (rc == -1) {
errno_assert (errno == ENFILE || errno == EMFILE);
*w_ = *r_ = -1;
return -1;
} else {
// If there's no SOCK_CLOEXEC, let's try the second best option. Note that
// race condition can cause socket not to be closed (if fork happens
// between socket creation and this point).
#if !defined ZMQ_HAVE_SOCK_CLOEXEC && defined FD_CLOEXEC
rc = fcntl (sv[0], F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
rc = fcntl (sv[1], F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
#endif
*w_ = sv[0];
*r_ = sv[1];
return 0;
}
#endif
}

4
src/signaler.hpp
View File

@ -66,10 +66,6 @@ class signaler_t
#endif
private:
// Creates a pair of file descriptors that will be used
// to pass the signals.
static int make_fdpair (fd_t *r_, fd_t *w_);
// Underlying write & read file descriptor
// Will be -1 if an error occurred during initialization, e.g. we
// exceeded the number of available handles

54
src/zmq.cpp
View File

@ -87,6 +87,7 @@ struct iovec
#include "signaler.hpp"
#include "socket_poller.hpp"
#include "timers.hpp"
#include "ip.hpp"
#if defined ZMQ_HAVE_OPENPGM
#define __PGM_WININT_H__
@ -121,42 +122,11 @@ int zmq_errno (void)
void *zmq_ctx_new (void)
{
#if defined ZMQ_HAVE_OPENPGM
// Init PGM transport. Ensure threading and timer are enabled. Find PGM
// protocol ID. Note that if you want to use gettimeofday and sleep for
// openPGM timing, set environment variables PGM_TIMER to "GTOD" and
// PGM_SLEEP to "USLEEP".
pgm_error_t *pgm_error = NULL;
const bool ok = pgm_init (&pgm_error);
if (ok != TRUE) {
// Invalid parameters don't set pgm_error_t
zmq_assert (pgm_error != NULL);
if (pgm_error->domain == PGM_ERROR_DOMAIN_TIME
&& (pgm_error->code == PGM_ERROR_FAILED)) {
// Failed to access RTC or HPET device.
pgm_error_free (pgm_error);
errno = EINVAL;
return NULL;
}
// PGM_ERROR_DOMAIN_ENGINE: WSAStartup errors or missing WSARecvMsg.
zmq_assert (false);
}
#endif
#ifdef ZMQ_HAVE_WINDOWS
// Intialise Windows sockets. Note that WSAStartup can be called multiple
// times given that WSACleanup will be called for each WSAStartup.
// We do this before the ctx constructor since its embedded mailbox_t
// object needs Winsock to be up and running.
WORD version_requested = MAKEWORD (2, 2);
WSADATA wsa_data;
int rc = WSAStartup (version_requested, &wsa_data);
zmq_assert (rc == 0);
zmq_assert (LOBYTE (wsa_data.wVersion) == 2
&& HIBYTE (wsa_data.wVersion) == 2);
#endif
// object needs the network to be up and running (at least on Windows).
if (!zmq::initialize_network ()) {
return NULL;
}
// Create 0MQ context.
zmq::ctx_t *ctx = new (std::nothrow) zmq::ctx_t;
@ -181,17 +151,7 @@ int zmq_ctx_term (void *ctx_)
// Shut down only if termination was not interrupted by a signal.
if (!rc || en != EINTR) {
#ifdef ZMQ_HAVE_WINDOWS
// On Windows, uninitialise socket layer.
rc = WSACleanup ();
wsa_assert (rc != SOCKET_ERROR);
#endif
#if defined ZMQ_HAVE_OPENPGM
// Shut down the OpenPGM library.
if (pgm_shutdown () != TRUE)
zmq_assert (false);
#endif
zmq::shutdown_network ();
}
errno = en;
@ -722,7 +682,7 @@ const char *zmq_msg_gets (const zmq_msg_t *msg_, const char *property_)
}
}
// Polling.
// Polling.
#if defined ZMQ_HAVE_POLLER
inline int zmq_poller_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)

173
unittests/unittest_poller.cpp
View File

@ -20,9 +20,15 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "../tests/testutil.hpp"
#include <poller.hpp>
#include <i_poll_events.hpp>
#include <ip.hpp>
#include <unity.h>
#ifndef _WIN32
#define closesocket close
#endif
void setUp ()
{
}
@ -36,12 +42,177 @@ void test_create ()
zmq::poller_t poller (thread_ctx);
}
#if 0
// TODO this triggers an assertion. should it be a valid use case?
void test_start_empty ()
{
zmq::thread_ctx_t thread_ctx;
zmq::poller_t poller (thread_ctx);
poller.start ();
msleep (SETTLE_TIME);
}
#endif
struct test_events_t : zmq::i_poll_events
{
test_events_t (zmq::fd_t fd_, zmq::poller_t &poller_) :
fd (fd_),
poller (poller_)
{
}
virtual void in_event ()
{
in_events.add (1);
poller.rm_fd (handle);
handle = (zmq::poller_t::handle_t) NULL;
}
virtual void out_event ()
{
// TODO
}
virtual void timer_event (int id_)
{
LIBZMQ_UNUSED (id_);
timer_events.add (1);
poller.rm_fd (handle);
handle = (zmq::poller_t::handle_t) NULL;
}
void set_handle (zmq::poller_t::handle_t handle_) { handle = handle_; }
zmq::atomic_counter_t in_events, timer_events;
private:
zmq::fd_t fd;
zmq::poller_t &poller;
zmq::poller_t::handle_t handle;
};
void wait_in_events (test_events_t &events)
{
void *watch = zmq_stopwatch_start ();
while (events.in_events.get () < 1) {
#ifdef ZMQ_BUILD_DRAFT
TEST_ASSERT_LESS_OR_EQUAL_MESSAGE (SETTLE_TIME,
zmq_stopwatch_intermediate (watch),
"Timeout waiting for in event");
#endif
}
zmq_stopwatch_stop (watch);
}
void wait_timer_events (test_events_t &events)
{
void *watch = zmq_stopwatch_start ();
while (events.timer_events.get () < 1) {
#ifdef ZMQ_BUILD_DRAFT
TEST_ASSERT_LESS_OR_EQUAL_MESSAGE (SETTLE_TIME,
zmq_stopwatch_intermediate (watch),
"Timeout waiting for timer event");
#endif
}
zmq_stopwatch_stop (watch);
}
void create_nonblocking_fdpair (zmq::fd_t *r, zmq::fd_t *w)
{
int rc = zmq::make_fdpair (r, w);
TEST_ASSERT_EQUAL_INT (0, rc);
TEST_ASSERT_NOT_EQUAL (zmq::retired_fd, *r);
TEST_ASSERT_NOT_EQUAL (zmq::retired_fd, *w);
zmq::unblock_socket (*r);
zmq::unblock_socket (*w);
}
void send_signal (zmq::fd_t w)
{
#if defined ZMQ_HAVE_EVENTFD
const uint64_t inc = 1;
ssize_t sz = write (w, &inc, sizeof (inc));
assert (sz == sizeof (inc));
#else
{
char msg[] = "test";
int rc = send (w, msg, sizeof (msg), 0);
assert (rc == sizeof (msg));
}
#endif
}
void close_fdpair (zmq::fd_t w, zmq::fd_t r)
{
int rc = closesocket (w);
TEST_ASSERT_EQUAL_INT (0, rc);
#if !defined ZMQ_HAVE_EVENTFD
rc = closesocket (r);
TEST_ASSERT_EQUAL_INT (0, rc);
#else
LIBZMQ_UNUSED (r);
#endif
}
void test_add_fd_and_start_and_receive_data ()
{
zmq::thread_ctx_t thread_ctx;
zmq::poller_t poller (thread_ctx);
zmq::fd_t r, w;
create_nonblocking_fdpair (&r, &w);
test_events_t events (r, poller);
zmq::poller_t::handle_t handle = poller.add_fd (r, &events);
events.set_handle (handle);
poller.set_pollin (handle);
poller.start ();
send_signal (w);
wait_in_events (events);
// required cleanup
close_fdpair (w, r);
}
void test_add_fd_and_remove_by_timer ()
{
zmq::fd_t r, w;
create_nonblocking_fdpair (&r, &w);
zmq::thread_ctx_t thread_ctx;
zmq::poller_t poller (thread_ctx);
test_events_t events (r, poller);
zmq::poller_t::handle_t handle = poller.add_fd (r, &events);
events.set_handle (handle);
poller.add_timer (50, &events, 0);
poller.start ();
wait_timer_events (events);
// required cleanup
close_fdpair (w, r);
}
int main (void)
{
UNITY_BEGIN ();
zmq::initialize_network ();
setup_test_environment ();
UNITY_BEGIN ();
RUN_TEST (test_create);
RUN_TEST (test_add_fd_and_start_and_receive_data);
RUN_TEST (test_add_fd_and_remove_by_timer);
zmq::shutdown_network ();
return UNITY_END ();
}

41
unittests/unittest_ypipe.cpp
View File

@ -35,12 +35,53 @@ void test_create ()
zmq::ypipe_t<int, 1> ypipe;
}
void test_check_read_empty ()
{
zmq::ypipe_t<int, 1> ypipe;
TEST_ASSERT_FALSE (ypipe.check_read ());
}
void test_read_empty ()
{
zmq::ypipe_t<int, 1> ypipe;
int read_value = -1;
TEST_ASSERT_FALSE (ypipe.read (&read_value));
TEST_ASSERT_EQUAL (-1, read_value);
}
void test_write_complete_and_check_read_and_read ()
{
const int value = 42;
zmq::ypipe_t<int, 1> ypipe;
ypipe.write (value, false);
TEST_ASSERT_FALSE (ypipe.check_read ());
int read_value = -1;
TEST_ASSERT_FALSE (ypipe.read (&read_value));
TEST_ASSERT_EQUAL_INT (-1, read_value);
}
void test_write_complete_and_flush_and_check_read_and_read ()
{
const int value = 42;
zmq::ypipe_t<int, 1> ypipe;
ypipe.write (value, false);
ypipe.flush ();
TEST_ASSERT_TRUE (ypipe.check_read ());
int read_value = -1;
TEST_ASSERT_TRUE (ypipe.read (&read_value));
TEST_ASSERT_EQUAL_INT (value, read_value);
}
int main (void)
{
setup_test_environment ();
UNITY_BEGIN ();
RUN_TEST (test_create);
RUN_TEST (test_check_read_empty);
RUN_TEST (test_read_empty);
RUN_TEST (test_write_complete_and_check_read_and_read);
RUN_TEST (test_write_complete_and_flush_and_check_read_and_read);
return UNITY_END ();
}